SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Tai Zhang,Changfa Xiao,Jian Zhao,Xiaozhen Liu,Dawei Ji,Hui Zhang
Highly efficient separation of emulsified oily wastewater, especially for surfactant-stabilized water-in-oil emulsions is urgently demanded and still worldwide challenge. Herein, a superoleophilic and under oil superhydrophobic Poly (vinylidene fluoride) (PVDF)/graphene (GE) composite nanofibrous membrane (GPNM) was fabricated through a simple one-step electrospinning strategy for highly efficient gravity-driven surfactant-stabilized water-in-oil emulsions separation. The resultant membrane possessed water contact angel of 140.1°±1.1°, oil contact angel of nearly 0°, as well as under oil ultralow water adhesion ability. Furthermore, the morphology, pore size and surface wettability of as-prepared nanofibrous membranes were simply tuned by adjusting the concentration of GE in electrospinning solution. Thanks to the narrow pore size distribution , high porosity (＞92.8%), and the intrinsic strong oil affinity of GE nanosheet , the composite membrane showed outstanding Span 80 surfactant-stabilized water-in-oil emulsions separation efficiency as high as 99.8% with corresponding permeation flux up to 23794 ± 928 L m −2 h −1 bar −1 during gravity-driven separation process. The exceptional oil absorption performance was also displayed by collecting floated oils on water surface. The results would make our composite nanofibrous membranes a great promise of dealing with practical oily wastewater remediation.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jingxuan Zhao,Hongxu Liu,Yuchao Qi,Ruijia Wang,Ziwei Lv,Yang Yu,Shulin Sun
With the rapid development of industry, the problem of water pollution has become increasingly serious. Though there are many separation materials available to solve this problem, how to separate multiple wastewater at the same time remains a challenge. Hydrogel coating is suitable for use in the field of oil–water separation, and chitosan (CS) is effective in removing anionic dyes. Therefore, the preparation of separation membranes with hydrogel coating containing CS and dopamine (DA) can effectively separate oil–water emulsion and anionic dye wastewater. In this paper, DA@CNTs/CS hydrogel coating was prepared by sequentially coating Cu 2+ , DA@CNTs, Cu 2+ and CS on the surface of polyvinylidene fluoride (PVDF) membrane by deposition of self-assembly, which enhanced the hydrophilicity of the membrane and made it highly underwater oleophobic and antifouling. The alkali treated PVDF membrane contained a large amount of –OH, Cu 2+ , which formed coordination bonds with –OH, CS, and DA and the hydrogel coating could be stably loaded on the membrane. In addition, the introduction of rigid CNTs effectively improved the performance of the modified membrane under extreme conditions such as high pH and high salt concentration. PVDF-DA@CNTs/CS membrane had an ideal pure water flux (PWF) of 1470 (L·m −2 ·h −1 ) and the separation efficiency of 99.7 % for anionic dye and 99.4 % for oil–water emulsion. The contaminant on the membrane surface can be quickly removed by washing with DI water. The overall performance of the membrane is also maintained at a very high level of long-term filtration of wastewater. In summary, this study provides a new approach to complex wastewater treatment technology.
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CHEMICAL ENGINEERING SCIENCE
·
2023
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IF 4.7
Tunmise Ayode Otitoju,Yun Bai,Yaxiong Tian,Zhongmin Feng,Yun Wang,Xia Zhang,Ting Sun
Herein, we present a novel polyvinylidene fluoride/vanadium-titanium dioxide (PVDF-TiO 2 /V) membranes prepared using LBL self-assembly. The membranes were tested for ultrafiltration of bovine serum albumin solution and photodegradation of SMX solution. The neat PVDF membrane was endowed with photocatalytic function due to the synergistic interaction of TiO 2 and V. The structure and morphology of PVDF-TiO 2 /V membranes were characterized using a variety of techniques, showing that TiO 2 /V particles had been successfully integrated on the membrane surface. By increasing the number of TiO 2 /V layers, contact angle tests demonstrated that the membranes hydrophilicity has been significantly improved. The FTIR result demonstrated that the TiO 2 /V was affixed to the surface of the PVDF membrane by interfacial interactions. The thermal property of the PVDF membrane was also improved with the assembly of TiO 2 /V on the membrane surface. The PVDF-TiO 2 /V membranes maintained a high BSA rejection of 99.4 % and FRR of 97.4 % while showing a water flux up to 390.07 kg m -2 h −1 , which is ∼1.5 times higher than that of neat PVDF membrane. Specifically, the membranes were capable of degrading SMX under visible-light. The photocatalytic activity for SMX increased with the number of TiO 2 /V layers, attaining the highest value with four self-assembled TiO 2 /V layers. The reaction rate of the optimum membrane was 11.57-fold compared to the neat membrane under visible-light. Furthermore, 95.9 % degradation efficiency was achieved, even after six cycles. More importantly, BPA, MO, and MB could be photodegraded using the PVDF-TiO 2 /V membranes. Compared to using bulk or powdered photocatalysts, the PVDF-TiO 2 /V membrane is more practical and promising for wastewater remediation due to its many advantages including better long-term stability, ability to endure pollutant degradation, low cost, and environmentally friendly.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2024
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IF 3.8
Tianci Lv,Fubin Liu,Mengqian Xiao,Ying Liu,Litao Wang,Guihua Gao
In this study, a novel hierarchical pore MIL-101(Cr) foam (HPF-MIL-101) was designed and prepared using the sacrificial template method with NaCl as the sacrificial template. This method involved grinding, heating, and washing the NaCl template to produce HPF-MIL-101, with PVDF as the binder and MIL-101(Cr) as the adsorbent. This preparation process is both straightforward and cost-effective, avoiding the use or generation of any organic reagents, thereby offering an environmentally sustainable approach for producing metal-organic framework (MOF) composites. The prepared HPF-MIL-101 exhibited excellent adsorption capabilities for both anionic dye (methyl orange, MO) and cationic dye (methylene blue, MB). The adsorption process followed a pseudo-second-order kinetic model and Friedrich isotherm model, indicating a multilayer adsorption. This is further supported by the Weber-Morris intraparticle diffusion model, which divided the adsorption process into three stages. Furthermore, the adsorption process was consistent with the Freundlich isotherm model, with a correlation coefficient ( r ) greater than 0.96. HPF-MIL-101 can also be used as an adsorbent for solid phase extraction (SPE). Therefore, an SPE method combined with high-performance liquid chromatography (HPLC) was developed using HPF-MIL-101 as the adsorbent to analyze five fluoroquinolones (FQs) in water samples. This analytical method showed good linearity in the range of 30–2000 ng·mL −1 , with excellent linear correlation coefficient ( r = 0.9991–0.9999), reasonable extraction recoveries ranging from 80.39 to 112.7 % (RSD ≤ 7.9 %), and low limits of detection (8–30 ng·mL −1 ). Overall, the results indicated that HPF-MIL-101 not only had a simple, environment-friendly, and pollution-free preparation process but also can be reused for enrichment and detection of trace FQs in water. Thus, HPF-MIL-101 exhibits immense application potential in environmental pollutant removal and also provides a valuable reference for the preparation and application of other MOF composites.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Zongkui Qin,Tian Lei,Nengxiang Wu,Xinxiang Shu,Leilei Liu,Zhijian Tan
Developing efficient methods for separating and purifying citrus flavonoids is challenging. This work explored a temperature-responsive composite membrane using poly(ionic liquid) (PIL), polyvinylidene fluoride (PVDF), and metal–organic frameworks (MOFs), enabling selective separation of flavonoid glycosides (naringin and neohesperidin) and aglycones (naringenin and hesperetin). A PIL containing temperature-responsive monomer of N-isopropylacrylamide (NIPAM), was doped into the PVDF matrix, and zeolitic imidazolate framework-8 (ZIF-8) was anchored on the PIL/PVDF membrane surface via in-situ synthesis, forming a stable structure. Their porosity, hydrophobicity, thermal stability, and mechanical strength were confirmed. When the temperature increased from 30 to 35 °C, the membrane pore size significantly expanded due to the contraction effect of NIPAM, resulting in an increase in the water flux of the four composite membranes by more than 27.8 %. Furthermore, five experimental variables, including the molar ratio of PIL monomer, temperature, feed concentration, feed pH, and NaCl concentration were selected to systematically evaluate the separation performance of the composite membrane for four citrus flavonoids. The results demonstrated that the composite membrane containing both ZIF-8 and PIL exhibited significantly higher separation efficiency compared to pure PVDF and PIL/PVDF membranes. Among them, the M4 membrane performed the best, achieving a total rejection rate of 307.35 % and a separation selectivity of 47.77 % for the four flavonoids at 25 °C. The composite membrane could be regenerated using an alkaline solution (pH = 11), with a total recovery rate of 312.13 % for the four flavonoids, including a recovery rate of 95.39 % for naringenin. Although the membrane structure remained intact after five reuse cycles, the rejection rate showed a decline. This composite membrane is a promising candidate material that can efficiently and selectively separate flavonoid glycosides and aglycones and offers a reference for the separation of other plant active components.
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Nano Select
·
2021
·Vol. 2
·期 7
·1403-1416
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IF 0
Bin Yang,Yang-nan Yu,Yang Pan,Shu-qing Wang,Xiang Xu,Ying-ying Wang,Jia-sheng Qian,Ru Xia,Peng Zhang,You Shi,You-lei Tu
In this research, series of PVDF microporous films with various polymer concentrations and thickness were prepared through thermally-induced phase separation in air condition with diphenyl carbonate as the diluent. Effects of polymer concentration and film thickness on the formation kinetics of microporous structure of PVDF thin films were in situ investigated via TII technique. The instantaneous heat conduction inside the films during film formation was also evaluated. Two types of parameter models were adopted in order to disclose the time and location dependence of TIPS film solidification kinetics, respectively. Hierarchical microstructures, crystallization behavior and thermal properties of the TIPS films were also characterized by SEM, DSC, and TGA, respectively. The current study could supply an insight into the fabrication of PVDF microporous films with target microstructure and desirable performance.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Jingxuan Zhao,Hongxu Liu,Yuchao Qi,Ruijia Wang,Ziwei Lv,Yang Yu,Shulin Sun,Yiming Wang
In this work CS-SDAEM polymer brushes with long-chain structure were synthesized, and TiO 2 /CS-SDAEM nanoparticles were prepared by modifying them on the TiO 2 surface. The prepared modified membrane can effectively degrade dyes through photocatalysis and can reduce the contamination rate of the membrane during use. The separation membrane achieves efficient removal of contamination by self-cleaning. The results of the membrane surface analysis test show that the formation of coordination bonds between o-benzenetriol of GA and TiO 2 , and the chemical reaction between CS and GA, which promote the stability between coating components. The results of filtering tests show that with the excellent anti-fouling performance of long-chain polymer brush, the photodegradability of TiO 2 and a large number of hydrophilic groups contained in GA and CS, PVDF- TiO 2 /CS-SDAEM membranes overcome the above shortcomings and achieve super-hydrophilicity, anti-fouling and self-cleaning. In addition, DFT model simulations of photocatalytic processes show that there is a charge transfer between CS and TiO 2 , which increases the width of the high light absorption band and improves the efficiency of photodegradation. Modified membranes achieve efficient self-cleaning processes and low flux decline rates, which hold great promise for use in real wastewater application scenarios.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Jingxuan Zhao,Ying Xue,Yue Wu,Xiaonan Hao,Shulin Sun,Huiliang Zhang
This study presents an innovative approach to membrane fabrication by integrating electrospinning with surface modification techniques to develop a novel dual-layer protective membrane system. The key innovation lies in the incorporation of photothermally responsive nanocomposites, enabling multifunctional membrane performance. The primary layer is a PVDF-PNIPAAm thermoresponsive matrix synthesized by radical polymerization, integrated with BN@PDA-Ag nanosheets. This design combines Ag nanoparticles’ photothermal conversion and BN’s thermal conductivity to regulate pore size via PNIPAAm chain conformational changes induced by temperature. The secondary layer, comprising CS@CNT and PVDF, significantly enhances membrane hydrophilicity and antifouling properties through chitosan’s hydrophilic groups and chelating capabilities. The membrane demonstrates self-cleaning, adaptive filtration, antifouling and high flux, representing a significant advancement in smart membrane technology for water treatment applications.
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JOURNAL OF MEMBRANE SCIENCE
·
2018
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IF 6.578
Lihao Xu,Yang He,Xia Feng,Fengying Dai,Ning Yang,Yiping Zhao,Li Chen
In the separation of oil/water emulsions using membrane separation methods, fouling remains a problem. To improve the fouling resistance effectively, a hydrophilic tannic acid (TA) coating was constructed on the poly(vinylidene fluoride) (PVDF) membrane via dip-coating method. Both the wettability and surface free energy were dramatically enhanced after the introduction of the TA coating. TA deposition with extended dip-coating time did not result in a corresponding increase in the pure water permeate quality, suggesting that there is a trade-off between the enhanced surface hydrophilicity and diminished pore size. Furthermore, the threshold fluxes were determined using the flux-stepping method, and explored to provide guidance on membrane fouling rates for oil/water emulsion filtration. The hydrophilic TA dip-coated PVDF membrane prepared at a dip-coating time of 9 h exhibited the highest threshold flux compared to the other membranes. The experimental evidences of the threshold fluxes can be used to predict the sustainable flux regimes for the TA dip-coated membranes. Constant flux verifiable experiments for oil/water emulsion were performed at fluxes near and below the threshold fluxes. By selecting a constant flux strategy below the threshold flux, membrane over-fouling can be avoided efficiently and the operating period can be prolonged favourably. More generally, operation below the threshold flux recognizes a modest fouling level, arising from the sufficient flux, which would result in the infrequent need for cleaning and is a compromise between capital expenditure and operating costs.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Yudi Guo,Jiaming Li,Erqing Zhao
Sc and B doping enlarges the electrolyte lattice and reduces grain boundaries. • The LASBTP003 electrolyte shows an optimal ionic conductivity of 0.882 mS/cm. • PVDF-HFP-LITFSI-SN-10LASBTP003 SCE displays enhanced electrochemical performance. • Li/SCE/ LiFePO 4 full cell shows an excellent long-term cycling stability. NASICON-type Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP), with excellent air stability, a wide electrochemical window and low cost, is an attractive electrolyte for lithium-ion batteries (LIBs). However, its low electrical conductivity and poor interface contact impede its practical applications. Herein, LATP was doped with Sc and B elements, and the properties of the resultant LATP-based solid electrolytes were thoroughly studied. The structural characterization suggests that doping of Sc and B densifies the electrolyte structure, enlarges the lattice, and reduces grain boundaries. The optimized Li 1.3 Al 0.24 Sc 0.03 B 0.03 Ti 1.7 (PO 4 ) 3 (LASBTP003) achieves a high ionic conductivity of 8.82 × 10 −4 S/cm, equivalent to 4-fold that of pure LATP. The composition of LASBTP003 electrolyte with PVDF-HFP and SN results in PVDF-HFP-LITFSI-SN-LASBTP003 solid composite electrolyte with enhanced ionic conductivity of 8.89 × 10 −5 S/cm, attributed to the reduced PVDF-HFP crystallization and established lithium-ion migration pathways at LASBTP003/PVDF-HFP interface. PVDF-HFP-LITFSI-SN-10LASBTP003 also displays a wide electrochemical window of 4.85 V and a high Li-ion transference number of 0.41. The Li/ PVDF-HFP-LITFSI-SN-10LASBTP003/Li symmetric battery delivers a long cycling of 1800 h under a current density of 0.1 mA/cm 2 . Moreover, LiFePO 4 /PVDF-HFP-LITFSI-SN-10LASBTP003/Li full cell delivers a long-term cycling stability, with a capacity retention of 86.92% after 1000 cycles at 0.5C. Overall, the proposed PVDF-HFP-LITFSI-SN-10LASBTP003 has great potential for LIB applications. Download: Download high-res image (195KB) Download: Download full-size image
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Hongxu Liu,Junhao Xie,Jingxuan Zhao,Ruijia Wang,Yuchao Qi,Ziwei Lv,Yang Yu,Shulin Sun
The industrial wastewater filtered by water treatment membranes is very complex in practical applications, therefore, it is a challenge to prepare a membrane with large pore size and high flux that can efficiently separate various wastewater containing pollutants of different scales. To solve this problem, an SA-TiO 2 hydrogel-coated PVDF-g-IL composite fibre membrane with super hydrophilicity, anti-pollution, and pH-responsive self-cleaning properties has been designed and prepared by electrostatic spinning and layer-by-layer coating techniques in the present work. The super hydrophilic gel layer on the surface gives the composite membrane efficient separation capability while maintaining rapid passage of the aqueous phase; the underlying PVDF-g-IL fibre membrane is positively charged and removes not only anionic/cationic pollutants by electrostatic repulsion or attraction but also creates an ionic bond with oppositely assigned SA so that the gel layer tightly bond to the base membrane. The PVDF-g-IL@SA-TiO 2 membrane achieves stable and efficient separation of oil-water emulsions and dye wastewaters with a high filtration flux while retaining a retention rate higher than ∼95%. After multiple self-cleaning cycles, the ultra-thin gel layer still offers satisfactory durability with ≈100% flux recovery. This study provides a promising new strategy for designing efficient multiple contaminant separation and simpler self-cleaning membranes.
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高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yongrun Dong,Wen Li,Tao Huang,Shuaigang Ge,Linghang Kong,Chuang Ning,Zequan Li,Wei Gao,Bingsuo Zou
Recently, lead-free double perovskites have been regarded as a promising alternative to lead halide perovskites due to their wide emission band, and environmental protection and stability properties, and are expected to become a series of rising star materials in the lighting field. However, currently, the growth of most lead-free double perovskites occurs in the strong acid environment, which not only brings high cost and environment risk, but also makes it hard to realize large-scale applications with powder products. Herein, we apply a strategy of in situ synthesis of lead-free double perovskites in a polymer matrix by using a small amount of precursors and relatively friendly DMSO solvent to obtain efficiently luminescent Sb3+/Mn2+ co-doped Cs2KInCl6/PVDF composite films in a large-area. The co-doping of Mn2+/Sb3+ into this inorganic double perovskite matrix makes microcrystals with good crystallinity and size distribution in this polymer. The as prepared co-doping composite film with Mn/Sb feeding ratio 16 : 1 shows the brightest white light emission under 320 nm excitation, with a photoluminescence quantum yield (PLQY) as high as 86.98%. The energy transfer (E-T) from the charge-transfer band to the triplet self-trapped exciton (STE) around Sb3+ and then to the ferromagnetic (FM) coupled Mn2+ pair 3d state was confirmed by the temperature-dependent PL spectra and density functional theory calculations. Finally, a single-compound white light emitting diode with chromatic coordinates of (0.31, 0.33) and fluorescent anti-counterfeiting labels could be fabricated based on this composite film with the best white emission. This work provides a new strategy for the application of lead-free double perovskites in the fields of lighting and anti-counterfeiting.
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高影响因子
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